DMS 150 - Final Exam review System Operations Doppler
Artifacts Questions With Complete Solutions
____ are the cause of *most* artifacts. Correct Answers
specular reflectors
____ is a technique to reduce the dynamic range of a signal.
Correct Answers compression
_____ is another means by which to limit dynamic range
through suppressing smaller, weaker signals. Correct Answers
rejection
_____ results in a misregistration of a structure because the
actual propagation velocity is NOT the assumed propagation
velocity of 1540 m/s. Correct Answers speed error
_____ results in the appearance of strongly reflecting structures
multiple times at constant depth increments. Correct Answers
reverberation
______ is often called signal detection and consists of two
stages rectification & smoothing. Correct Answers
demodulation
______ is the process of making small signals larger. Correct
Answers amplification
_______ is a ratio of a maximum to a minimum. Correct
Answers dynamic range
, _______ is performed by a swept gain control often called Time
Gain Control (TGC) or Depth Gain Control (DGC). Correct
Answers compensation
________ is a means by which to reduce the signal dynamic
range usually through logarithmic amplification. Correct
Answers compression
________ is an artifactual smearing of the Doppler spectrum
resulting in peak velocity overestimation or underestimation.
Correct Answers spectral broadening
* ______ limits the high end of diagnostic frequency range.
Correct Answers penetration
* ______ shades of gray are visible to the human eye. Correct
Answers 64
* 100% reflection = Correct Answers new medium interface
that has a Z value vastly different from the original medium.
* amplitude of a sound wave = Correct Answers max variation
from the mean
* During compression, ____ is increased. Correct Answers
density
* incident angle = Correct Answers wavefront & interface
* intensity of an ultrasound beam = Correct Answers
power/area
Artifacts Questions With Complete Solutions
____ are the cause of *most* artifacts. Correct Answers
specular reflectors
____ is a technique to reduce the dynamic range of a signal.
Correct Answers compression
_____ is another means by which to limit dynamic range
through suppressing smaller, weaker signals. Correct Answers
rejection
_____ results in a misregistration of a structure because the
actual propagation velocity is NOT the assumed propagation
velocity of 1540 m/s. Correct Answers speed error
_____ results in the appearance of strongly reflecting structures
multiple times at constant depth increments. Correct Answers
reverberation
______ is often called signal detection and consists of two
stages rectification & smoothing. Correct Answers
demodulation
______ is the process of making small signals larger. Correct
Answers amplification
_______ is a ratio of a maximum to a minimum. Correct
Answers dynamic range
, _______ is performed by a swept gain control often called Time
Gain Control (TGC) or Depth Gain Control (DGC). Correct
Answers compensation
________ is a means by which to reduce the signal dynamic
range usually through logarithmic amplification. Correct
Answers compression
________ is an artifactual smearing of the Doppler spectrum
resulting in peak velocity overestimation or underestimation.
Correct Answers spectral broadening
* ______ limits the high end of diagnostic frequency range.
Correct Answers penetration
* ______ shades of gray are visible to the human eye. Correct
Answers 64
* 100% reflection = Correct Answers new medium interface
that has a Z value vastly different from the original medium.
* amplitude of a sound wave = Correct Answers max variation
from the mean
* During compression, ____ is increased. Correct Answers
density
* incident angle = Correct Answers wavefront & interface
* intensity of an ultrasound beam = Correct Answers
power/area
